Find the value of: $5 x + 3 y - 6 z when x = 3, y = 5 and z = 4$ .

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Solution

Step: Finding the value of $5 x + 3 y - 6 z$ .
On substituting $x = 3, y = 5 and z = 4 in 5 x + 3 y - 6 z$ ,
we get
$5 x + 3 y - 6 z = (5 \times 3) + (3 \times 5) - (6 \times 4)$
$= 15 + 15 - 24$
$= 30 - 24$
$= 6$
Therefore, the value of $5 x + 3 y - 6 z is 6$ .

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